Balance puppet-valve



(No Model.)

C. O. SMALL.

BALANGB PUPPB'T VALVE. No. 275,722

Patented Apr. 10,

, n. .nIHInII-.n

Vi'tnesses: l y IHUQTLOI: 2

2M a Fm@ UNITED STATES PATENT OFFICE.

CHARLES O. SMALL, OF HALLOWELL, MAINE.

BALANCE PUPPET-VALVE.

SPECIFICATION forming part of Lettezs Patent No. 275,722, dated April10, 1883. v

' Application filed January 13, 1883. (No model.)

To all whom it may concern:

Be it known that I, CHARLES O. SMALL, a citizen of the UnitedStates,residing at Hallowell, in the county of Kennebec and State ofMaine, have invented certain new and useful Improvements in BalancePuppet-Valves; and I do hereby declare the following to he a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had'to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspeciication.

My invention relates to that class of steamvalves known as puppet orbalance valves, and is designed to be used as a throttle-valve or as acut-oft' valve for a steam-engine.

The object of my invention is to produce a balance valve which shallhave but one seat, and in which the balance may be easily adjusted.

In the drawings, Figure l shows a longitudinal section through rrof Fig.2. Fig. 2shows section through m x of Fig. 1. Fig. 3 shows sectionthrough zz of Fig. l. Fig. 4 shows section through y y of Fig. l.

vA is the valve chamber or covering. F is the steam-inlet, and Gr theoutlet.

B is the balancevalve. This valve is made in the form of a hollowcylinder, having a clear opening throughout the center. The bar b"across the upper part supports the valve-stem b. The lower end of valveBis turned smaller than the upper end, forming a shoulder, which restsupon the valve-seater and forms the steamjoint when the valve is closed.A small flange, b', is turned on the valve immediately above the valveseat. A chamber, H, is turned in the valve-casing, and, connecting withthe inlet F, it entirely surrounds the valve B.

E E are the steam ports, and are openings through the side of the valve,immediately be- V low the iiange b', connecting with the interior.

C is a bushing, with a flange on its upper part, by which it is securedto the casing by screws passing through the covering B. The bushing Cincloses the valve B, and these two parts are made tight by thepackingrings D.

The valvestem is packed where it passes through the covering B.

When the valve is closed and the steam is admitted through the inlet Fit lls the chamber H, surrounding the valve, and presses the valveequally in all directions. The pressure exerted against any point on theside of the valve is balanced by equal pressure on the opposite side;but there will be adownward pressure on the ange b', which will tend tokeep the valve closed by pressing it down upon its seat. When the valveis opened it must be lifted against the pressure on flange b. The momentthe valve rises the steam enters the interior of the valve through thesteam-ports E E, and the pressure on b' is removed. The steam now fillsthe interior of the valve, passes up through it and fills the spaceabove, and passes o" through the outlet G. It is evident that after thesteam is first admitted the valve is perfectly free to move up and downuntil the moment when it is again completely closed. Dotted lines showvalve when open. 1f the upper part of the valve at b were made tightinstead of having an opening, as described, the pressure of the steamwould tend to raise the valve.

The width of the liange b may bevaried, causinga greater or less forceto be applied in opening the valve; or the liauge may be left olfaltogether, leaving the weight of the valve, or some outside pressureapplied to it, tostop the steam.

A valve thus constructed works with great ease, and has few parts whichare liable to get out of order.

I claim- In a valve-chamber, A, a balance-valve, B, smaller at its lowerthan at its upper end, and having ange b on its outside, and ports E,combined with chamber H and bushing C, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES O. SMALL.

Witnesses:

J. Q. A. HAwEs, J. WALTER BRITTON.

